Sewing machine attachment



Aug. 30, 1932. slLBERMAN 1,874,645

SEWING MACHINE ATTACHMENT Filed NOV. 4, 1930 2 Sheets-Sheet l mum Ill!!! Ell! Aug. 30, 1932. D. SlLBEZRMAN SEWING MACHINE ATTACHMENT Filed Nov. 4, 1950 2 Sheets-"Sheet 2 l VENTOR 17m J?! BY we :30 driven thereby.

point in the slot.

Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE '2. DAVID sILBERMANQOIt NEW YORK, N. Y., ASSIGNOR TO WALDES KOH-I-NOOB, INC., on

LONG ISLAND CITY, NEW YORK, acoRroR TIoN on NEW YORK SEWING MACHINE AT ACHME T My invention relates to devices for use on sewing machines to prevent the breaking of the needle when eye or eyelet tape is sewed I to garments and it is my object to produce a simple, small, reliable attachment which can be secured to any sewing machine and which will so engage and move the wire eyes or the eyelets on the tape that they will not be struck by the descending needle in such a way as to break the latter. My device does not in any way interfere with the normal feeding device on the sewing machine, whether of the four-way or roller type, but is entirely independent of and supplementary thereto.

In the drawings Fig. 1 is a top view of my device on a sewing machine; Fig. 2 a front view of the structure of Fig. 1; Fig. 3 a sectional view of the structure of Fig. 1 on the line 3-3 thereof; Fig. 4 an end view of the structure of Fig. 1, Fig. 5 aperspective view of the vibrating lever; and Fig. 6 a perspective view of the vibrating lever stop.

The device consists of a bed plate 1 provided with a bearing sleeve 2 depending below it. This bearing sleeve 2 carries a shaft 3 which has a gear 4 at its lower end adapted to engage a suitable driving gear 5 which is mounted on the sewing machine proper and An eccentric 6 is mounted on the upper end of the shaft 3 and bears on the upper face of the bed plate 1. A link 7 has one end slipped over the eccentric 6 and g lies on the base plate 1. A slide block 8, cut out on its under side to lie over the link 7 has a slot 9 cut vertically therethrough. A stud 10 passes through this slot and its lower end engages the other end of the link 7, a nut 11 serving to lock the stud at any desired An adjusting screw 12 extends inwardly from the end of the slide block to properly position this stud before the nut 11 is locked. A guide piece 13 secured to the bed plate 1 extends over the slide block 8 so that the latter may reciprocate or slide Application filed November 4,1930. Serial No. 493,315.

backwards and forwards on the bed plate 1 under the action of the eccentric, link and stud.

A vibrating lever 14. (shown in Fig. 5) is secured to a shaft 15 which passes through abearing hole in the slide block. A stop 16 (shown in Fig. 6) provided with an adjusting slot 17 is secured to the vibrating lever by a screw 18, with its upper arm adapted to engage the top surface of. the slide block as shown in Fig. 3 to limit the downward movement of the free end of the vibrating lever 14. An arm 19 is secured to the vibrating lever and the spring 20 connects the arm 19 with an. anchorage 21 on the'slide block (or a part fixed thereto) so that a normally downward pressure is exerted on the free end of the vibrating lever 14 with the stop 16 normally against the top surface of the slide block. The free end of the vibrating lever 14 has a downwardly extending fastener positioninghook 22 which is rounded ofi at 23 so that it will engage an eye or eyelet when moved in one direction and slip over it when moved in the other direction.

In use the device is secured to the sewing table t of a sewing machine with the bearing sleeve 2 extending downwardly, the gear 4 engaging a gear 5 011 a suitable shaft on the sewing machine properfor driving purposes. The nut 11 is then loosened and the adj usting screw 12 moved in or out until the hook 22 on the vibrating arm 14 is properly positionedwith respect to the needle n of the sewing machine whereupon the nut 11 is locked to hold the adjustment. The stop 16 is then adjusted up or down on the vibrating lever- 1 1 so that the hook 22 will bear properly on the eye or eyelet tape e when the tape is passing under the hook 22. As the eyes oreyelets pass under the hook the spring 20 will yield and allow the free end of the vibrating lever 14 to rise so that the eyes or eyelets will freely slide thereunder. In use the eye or eyelet tape 6 is fed under the presser foot p of the sewing machine and the needle n in the usual manner. The shaft 3 is revolved and this causes the. slide block to vibrate back and forth through the action of the eccentric, link and stud and move the vibrating lever backwards and forwards. In practice there are two reci rocations of the vibratinglever to one stroke of the needle.

' As the vibrating lever moves backwards and forwards the hook-like end 22 will engage the v eyes or eyelets and pull them away from the path of, travel of the needle, the, rounded side of the hook preventing the reverse stroke of the vibratinglever engaging and moving the eyes or eyelets;

In this way the eyes or eyelets are kept in a state of vibration and even should the nee= dle will e in motion and, as is well known inrmechanics, if two moving bodies collide one tendstoglance off the other, and the needle 7 will not be broken.

As my device is entirely independent of" v theZ regular sewing machine feed'it will operate on tape having any spacing of eyes or oint strike an eye or eyelet the latter of said shaft, an eccentric on the u per end of said shaft above the bed plate, a slide block, a guide for said block, a stud on said block,

means for positioning said stud with respect to said block, a vibrating arm swin ingly mounted on said block, a downwar ly extending fastener positioning hook pro'ection on the free end of said arm, means or imparting a normally downward pressure on the free end of said arm and means for limiting the downward; movement; of said arm.-

In. testimony whereof I have. m5. my

signature.

DAVID SILBERMAN.

eyelets, regular or irregular, and with any f number of stitches to the inch without change of adjustment,

I claim 1. An attachment for sewing machines comprising a base plate, a slide block thereon, a guide for said block, a vibrating arm one end ofwhich is swingingly' mounted on said block, a downwardly extending fastener:

.aidownwardly extendingfastener positioninghook projection on the free end of said arm andmeans for exerting a normall'y downsward pressure on the free end of saidarme 3. An attachment for sewing machines comprising a base plate, an eccentric mount-v ed thereon, means for revolving saideccentric, a slide block on said base plate,a guide for said block, a link, one end of which engages the eccentric, astud on said block em gagingthe other end of said link, a-vibratingarm swingingly mounted on said block, a downwardly extending fastener positioning hook projection on the free end of said am and means for exerting a normally dOWIl-r ward pressure on the free endof said arm.

4. An attachment for sewing machines comprising a bed plate, a shaft bearing there on, a shaft therein, a gear onthe lower. end 

